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Linux 4.19.133
[linux/fpc-iii.git] / drivers / usb / serial / mos7840.c
blob4a7bd26841af00b52b9d022e096800556fbaccc6
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Clean ups from Moschip version and a few ioctl implementations by:
4 * Paul B Schroeder <pschroeder "at" uplogix "dot" com>
5 *
6 * Originally based on drivers/usb/serial/io_edgeport.c which is:
7 * Copyright (C) 2000 Inside Out Networks, All rights reserved.
8 * Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
9 *
10 */
11
12 #include <linux/kernel.h>
13 #include <linux/errno.h>
14 #include <linux/slab.h>
15 #include <linux/tty.h>
16 #include <linux/tty_driver.h>
17 #include <linux/tty_flip.h>
18 #include <linux/module.h>
19 #include <linux/serial.h>
20 #include <linux/usb.h>
21 #include <linux/usb/serial.h>
22 #include <linux/uaccess.h>
23
24 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
25
26 /*
27 * 16C50 UART register defines
28 */
29
30 #define LCR_BITS_5 0x00 /* 5 bits/char */
31 #define LCR_BITS_6 0x01 /* 6 bits/char */
32 #define LCR_BITS_7 0x02 /* 7 bits/char */
33 #define LCR_BITS_8 0x03 /* 8 bits/char */
34 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
35
36 #define LCR_STOP_1 0x00 /* 1 stop bit */
37 #define LCR_STOP_1_5 0x04 /* 1.5 stop bits (if 5 bits/char) */
38 #define LCR_STOP_2 0x04 /* 2 stop bits (if 6-8 bits/char) */
39 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
40
41 #define LCR_PAR_NONE 0x00 /* No parity */
42 #define LCR_PAR_ODD 0x08 /* Odd parity */
43 #define LCR_PAR_EVEN 0x18 /* Even parity */
44 #define LCR_PAR_MARK 0x28 /* Force parity bit to 1 */
45 #define LCR_PAR_SPACE 0x38 /* Force parity bit to 0 */
46 #define LCR_PAR_MASK 0x38 /* Mask for parity field */
47
48 #define LCR_SET_BREAK 0x40 /* Set Break condition */
49 #define LCR_DL_ENABLE 0x80 /* Enable access to divisor latch */
50
51 #define MCR_DTR 0x01 /* Assert DTR */
52 #define MCR_RTS 0x02 /* Assert RTS */
53 #define MCR_OUT1 0x04 /* Loopback only: Sets state of RI */
54 #define MCR_MASTER_IE 0x08 /* Enable interrupt outputs */
55 #define MCR_LOOPBACK 0x10 /* Set internal (digital) loopback mode */
56 #define MCR_XON_ANY 0x20 /* Enable any char to exit XOFF mode */
57
58 #define MOS7840_MSR_CTS 0x10 /* Current state of CTS */
59 #define MOS7840_MSR_DSR 0x20 /* Current state of DSR */
60 #define MOS7840_MSR_RI 0x40 /* Current state of RI */
61 #define MOS7840_MSR_CD 0x80 /* Current state of CD */
62
63 /*
64 * Defines used for sending commands to port
65 */
66
67 #define MOS_WDR_TIMEOUT 5000 /* default urb timeout */
68
69 #define MOS_PORT1 0x0200
70 #define MOS_PORT2 0x0300
71 #define MOS_VENREG 0x0000
72 #define MOS_MAX_PORT 0x02
73 #define MOS_WRITE 0x0E
74 #define MOS_READ 0x0D
75
76 /* Requests */
77 #define MCS_RD_RTYPE 0xC0
78 #define MCS_WR_RTYPE 0x40
79 #define MCS_RDREQ 0x0D
80 #define MCS_WRREQ 0x0E
81 #define MCS_CTRL_TIMEOUT 500
82 #define VENDOR_READ_LENGTH (0x01)
83
84 #define MAX_NAME_LEN 64
85
86 #define ZLP_REG1 0x3A /* Zero_Flag_Reg1 58 */
87 #define ZLP_REG5 0x3E /* Zero_Flag_Reg5 62 */
88
89 /* For higher baud Rates use TIOCEXBAUD */
90 #define TIOCEXBAUD 0x5462
91
92 /* vendor id and device id defines */
93
94 /* The native mos7840/7820 component */
95 #define USB_VENDOR_ID_MOSCHIP 0x9710
96 #define MOSCHIP_DEVICE_ID_7840 0x7840
97 #define MOSCHIP_DEVICE_ID_7820 0x7820
98 #define MOSCHIP_DEVICE_ID_7810 0x7810
99 /* The native component can have its vendor/device id's overridden
100 * in vendor-specific implementations. Such devices can be handled
101 * by making a change here, in id_table.
102 */
103 #define USB_VENDOR_ID_BANDB 0x0856
104 #define BANDB_DEVICE_ID_USO9ML2_2 0xAC22
105 #define BANDB_DEVICE_ID_USO9ML2_2P 0xBC00
106 #define BANDB_DEVICE_ID_USO9ML2_4 0xAC24
107 #define BANDB_DEVICE_ID_USO9ML2_4P 0xBC01
108 #define BANDB_DEVICE_ID_US9ML2_2 0xAC29
109 #define BANDB_DEVICE_ID_US9ML2_4 0xAC30
110 #define BANDB_DEVICE_ID_USPTL4_2 0xAC31
111 #define BANDB_DEVICE_ID_USPTL4_4 0xAC32
112 #define BANDB_DEVICE_ID_USOPTL4_2 0xAC42
113 #define BANDB_DEVICE_ID_USOPTL4_2P 0xBC02
114 #define BANDB_DEVICE_ID_USOPTL4_4 0xAC44
115 #define BANDB_DEVICE_ID_USOPTL4_4P 0xBC03
116 #define BANDB_DEVICE_ID_USOPTL2_4 0xAC24
117
118 /* This driver also supports
119 * ATEN UC2324 device using Moschip MCS7840
120 * ATEN UC2322 device using Moschip MCS7820
121 * MOXA UPort 2210 device using Moschip MCS7820
122 */
123 #define USB_VENDOR_ID_ATENINTL 0x0557
124 #define ATENINTL_DEVICE_ID_UC2324 0x2011
125 #define ATENINTL_DEVICE_ID_UC2322 0x7820
126
127 #define USB_VENDOR_ID_MOXA 0x110a
128 #define MOXA_DEVICE_ID_2210 0x2210
129
130 /* Interrupt Routine Defines */
131
132 #define SERIAL_IIR_RLS 0x06
133 #define SERIAL_IIR_MS 0x00
134
135 /*
136 * Emulation of the bit mask on the LINE STATUS REGISTER.
137 */
138 #define SERIAL_LSR_DR 0x0001
139 #define SERIAL_LSR_OE 0x0002
140 #define SERIAL_LSR_PE 0x0004
141 #define SERIAL_LSR_FE 0x0008
142 #define SERIAL_LSR_BI 0x0010
143
144 #define MOS_MSR_DELTA_CTS 0x10
145 #define MOS_MSR_DELTA_DSR 0x20
146 #define MOS_MSR_DELTA_RI 0x40
147 #define MOS_MSR_DELTA_CD 0x80
148
149 /* Serial Port register Address */
150 #define INTERRUPT_ENABLE_REGISTER ((__u16)(0x01))
151 #define FIFO_CONTROL_REGISTER ((__u16)(0x02))
152 #define LINE_CONTROL_REGISTER ((__u16)(0x03))
153 #define MODEM_CONTROL_REGISTER ((__u16)(0x04))
154 #define LINE_STATUS_REGISTER ((__u16)(0x05))
155 #define MODEM_STATUS_REGISTER ((__u16)(0x06))
156 #define SCRATCH_PAD_REGISTER ((__u16)(0x07))
157 #define DIVISOR_LATCH_LSB ((__u16)(0x00))
158 #define DIVISOR_LATCH_MSB ((__u16)(0x01))
159
160 #define CLK_MULTI_REGISTER ((__u16)(0x02))
161 #define CLK_START_VALUE_REGISTER ((__u16)(0x03))
162 #define GPIO_REGISTER ((__u16)(0x07))
163
164 #define SERIAL_LCR_DLAB ((__u16)(0x0080))
165
166 /*
167 * URB POOL related defines
168 */
169 #define NUM_URBS 16 /* URB Count */
170 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
171
172 /* LED on/off milliseconds*/
173 #define LED_ON_MS 500
174 #define LED_OFF_MS 500
175
176 enum mos7840_flag {
177 MOS7840_FLAG_CTRL_BUSY,
178 MOS7840_FLAG_LED_BUSY,
179 };
180
181 static const struct usb_device_id id_table[] = {
182 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
183 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
184 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7810)},
185 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
186 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
187 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
188 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
189 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
190 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
191 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
192 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
193 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
194 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
195 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
196 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
197 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
198 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
199 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
200 {USB_DEVICE(USB_VENDOR_ID_MOXA, MOXA_DEVICE_ID_2210)},
201 {} /* terminating entry */
202 };
203 MODULE_DEVICE_TABLE(usb, id_table);
204
205 /* This structure holds all of the local port information */
206
207 struct moschip_port {
208 int port_num; /*Actual port number in the device(1,2,etc) */
209 struct urb *read_urb; /* read URB for this port */
210 __u8 shadowLCR; /* last LCR value received */
211 __u8 shadowMCR; /* last MCR value received */
212 char open;
213 char open_ports;
214 struct usb_serial_port *port; /* loop back to the owner of this object */
215
216 /* Offsets */
217 __u8 SpRegOffset;
218 __u8 ControlRegOffset;
219 __u8 DcrRegOffset;
220 /* for processing control URBS in interrupt context */
221 struct urb *control_urb;
222 struct usb_ctrlrequest *dr;
223 char *ctrl_buf;
224 int MsrLsr;
225
226 spinlock_t pool_lock;
227 struct urb *write_urb_pool[NUM_URBS];
228 char busy[NUM_URBS];
229 bool read_urb_busy;
230
231 /* For device(s) with LED indicator */
232 bool has_led;
233 struct timer_list led_timer1; /* Timer for LED on */
234 struct timer_list led_timer2; /* Timer for LED off */
235 struct urb *led_urb;
236 struct usb_ctrlrequest *led_dr;
237
238 unsigned long flags;
239 };
240
241 /*
242 * mos7840_set_reg_sync
243 * To set the Control register by calling usb_fill_control_urb function
244 * by passing usb_sndctrlpipe function as parameter.
245 */
246
247 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
248 __u16 val)
249 {
250 struct usb_device *dev = port->serial->dev;
251 val = val & 0x00ff;
252 dev_dbg(&port->dev, "mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
253
254 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
255 MCS_WR_RTYPE, val, reg, NULL, 0,
256 MOS_WDR_TIMEOUT);
257 }
258
259 /*
260 * mos7840_get_reg_sync
261 * To set the Uart register by calling usb_fill_control_urb function by
262 * passing usb_rcvctrlpipe function as parameter.
263 */
264
265 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
266 __u16 *val)
267 {
268 struct usb_device *dev = port->serial->dev;
269 int ret = 0;
270 u8 *buf;
271
272 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
273 if (!buf)
274 return -ENOMEM;
275
276 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
277 MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
278 MOS_WDR_TIMEOUT);
279 if (ret < VENDOR_READ_LENGTH) {
280 if (ret >= 0)
281 ret = -EIO;
282 goto out;
283 }
284
285 *val = buf[0];
286 dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val);
287 out:
288 kfree(buf);
289 return ret;
290 }
291
292 /*
293 * mos7840_set_uart_reg
294 * To set the Uart register by calling usb_fill_control_urb function by
295 * passing usb_sndctrlpipe function as parameter.
296 */
297
298 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
299 __u16 val)
300 {
301
302 struct usb_device *dev = port->serial->dev;
303 val = val & 0x00ff;
304 /* For the UART control registers, the application number need
305 to be Or'ed */
306 if (port->serial->num_ports == 4) {
307 val |= ((__u16)port->port_number + 1) << 8;
308 } else {
309 if (port->port_number == 0) {
310 val |= ((__u16)port->port_number + 1) << 8;
311 } else {
312 val |= ((__u16)port->port_number + 2) << 8;
313 }
314 }
315 dev_dbg(&port->dev, "%s application number is %x\n", __func__, val);
316 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
317 MCS_WR_RTYPE, val, reg, NULL, 0,
318 MOS_WDR_TIMEOUT);
319
320 }
321
322 /*
323 * mos7840_get_uart_reg
324 * To set the Control register by calling usb_fill_control_urb function
325 * by passing usb_rcvctrlpipe function as parameter.
326 */
327 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
328 __u16 *val)
329 {
330 struct usb_device *dev = port->serial->dev;
331 int ret = 0;
332 __u16 Wval;
333 u8 *buf;
334
335 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
336 if (!buf)
337 return -ENOMEM;
338
339 /* Wval is same as application number */
340 if (port->serial->num_ports == 4) {
341 Wval = ((__u16)port->port_number + 1) << 8;
342 } else {
343 if (port->port_number == 0) {
344 Wval = ((__u16)port->port_number + 1) << 8;
345 } else {
346 Wval = ((__u16)port->port_number + 2) << 8;
347 }
348 }
349 dev_dbg(&port->dev, "%s application number is %x\n", __func__, Wval);
350 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
351 MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
352 MOS_WDR_TIMEOUT);
353 if (ret < VENDOR_READ_LENGTH) {
354 if (ret >= 0)
355 ret = -EIO;
356 goto out;
357 }
358 *val = buf[0];
359 out:
360 kfree(buf);
361 return ret;
362 }
363
364 static void mos7840_dump_serial_port(struct usb_serial_port *port,
365 struct moschip_port *mos7840_port)
366 {
367
368 dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
369 dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset);
370 dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset);
371
372 }
373
374 /************************************************************************/
375 /************************************************************************/
376 /* I N T E R F A C E F U N C T I O N S */
377 /* I N T E R F A C E F U N C T I O N S */
378 /************************************************************************/
379 /************************************************************************/
380
381 static inline void mos7840_set_port_private(struct usb_serial_port *port,
382 struct moschip_port *data)
383 {
384 usb_set_serial_port_data(port, (void *)data);
385 }
386
387 static inline struct moschip_port *mos7840_get_port_private(struct
388 usb_serial_port
389 *port)
390 {
391 return (struct moschip_port *)usb_get_serial_port_data(port);
392 }
393
394 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
395 {
396 struct moschip_port *mos7840_port;
397 struct async_icount *icount;
398 mos7840_port = port;
399 if (new_msr &
400 (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
401 MOS_MSR_DELTA_CD)) {
402 icount = &mos7840_port->port->icount;
403
404 /* update input line counters */
405 if (new_msr & MOS_MSR_DELTA_CTS)
406 icount->cts++;
407 if (new_msr & MOS_MSR_DELTA_DSR)
408 icount->dsr++;
409 if (new_msr & MOS_MSR_DELTA_CD)
410 icount->dcd++;
411 if (new_msr & MOS_MSR_DELTA_RI)
412 icount->rng++;
413
414 wake_up_interruptible(&port->port->port.delta_msr_wait);
415 }
416 }
417
418 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
419 {
420 struct async_icount *icount;
421
422 if (new_lsr & SERIAL_LSR_BI) {
423 /*
424 * Parity and Framing errors only count if they
425 * occur exclusive of a break being
426 * received.
427 */
428 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
429 }
430
431 /* update input line counters */
432 icount = &port->port->icount;
433 if (new_lsr & SERIAL_LSR_BI)
434 icount->brk++;
435 if (new_lsr & SERIAL_LSR_OE)
436 icount->overrun++;
437 if (new_lsr & SERIAL_LSR_PE)
438 icount->parity++;
439 if (new_lsr & SERIAL_LSR_FE)
440 icount->frame++;
441 }
442
443 /************************************************************************/
444 /************************************************************************/
445 /* U S B C A L L B A C K F U N C T I O N S */
446 /* U S B C A L L B A C K F U N C T I O N S */
447 /************************************************************************/
448 /************************************************************************/
449
450 static void mos7840_control_callback(struct urb *urb)
451 {
452 unsigned char *data;
453 struct moschip_port *mos7840_port;
454 struct device *dev = &urb->dev->dev;
455 __u8 regval = 0x0;
456 int status = urb->status;
457
458 mos7840_port = urb->context;
459
460 switch (status) {
461 case 0:
462 /* success */
463 break;
464 case -ECONNRESET:
465 case -ENOENT:
466 case -ESHUTDOWN:
467 /* this urb is terminated, clean up */
468 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
469 goto out;
470 default:
471 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
472 goto out;
473 }
474
475 dev_dbg(dev, "%s urb buffer size is %d\n", __func__, urb->actual_length);
476 if (urb->actual_length < 1)
477 goto out;
478
479 dev_dbg(dev, "%s mos7840_port->MsrLsr is %d port %d\n", __func__,
480 mos7840_port->MsrLsr, mos7840_port->port_num);
481 data = urb->transfer_buffer;
482 regval = (__u8) data[0];
483 dev_dbg(dev, "%s data is %x\n", __func__, regval);
484 if (mos7840_port->MsrLsr == 0)
485 mos7840_handle_new_msr(mos7840_port, regval);
486 else if (mos7840_port->MsrLsr == 1)
487 mos7840_handle_new_lsr(mos7840_port, regval);
488 out:
489 clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mos7840_port->flags);
490 }
491
492 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
493 __u16 *val)
494 {
495 struct usb_device *dev = mcs->port->serial->dev;
496 struct usb_ctrlrequest *dr = mcs->dr;
497 unsigned char *buffer = mcs->ctrl_buf;
498 int ret;
499
500 if (test_and_set_bit_lock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags))
501 return -EBUSY;
502
503 dr->bRequestType = MCS_RD_RTYPE;
504 dr->bRequest = MCS_RDREQ;
505 dr->wValue = cpu_to_le16(Wval); /* 0 */
506 dr->wIndex = cpu_to_le16(reg);
507 dr->wLength = cpu_to_le16(2);
508
509 usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
510 (unsigned char *)dr, buffer, 2,
511 mos7840_control_callback, mcs);
512 mcs->control_urb->transfer_buffer_length = 2;
513 ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
514 if (ret)
515 clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags);
516
517 return ret;
518 }
519
520 static void mos7840_set_led_callback(struct urb *urb)
521 {
522 switch (urb->status) {
523 case 0:
524 /* Success */
525 break;
526 case -ECONNRESET:
527 case -ENOENT:
528 case -ESHUTDOWN:
529 /* This urb is terminated, clean up */
530 dev_dbg(&urb->dev->dev, "%s - urb shutting down: %d\n",
531 __func__, urb->status);
532 break;
533 default:
534 dev_dbg(&urb->dev->dev, "%s - nonzero urb status: %d\n",
535 __func__, urb->status);
536 }
537 }
538
539 static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
540 __u16 reg)
541 {
542 struct usb_device *dev = mcs->port->serial->dev;
543 struct usb_ctrlrequest *dr = mcs->led_dr;
544
545 dr->bRequestType = MCS_WR_RTYPE;
546 dr->bRequest = MCS_WRREQ;
547 dr->wValue = cpu_to_le16(wval);
548 dr->wIndex = cpu_to_le16(reg);
549 dr->wLength = cpu_to_le16(0);
550
551 usb_fill_control_urb(mcs->led_urb, dev, usb_sndctrlpipe(dev, 0),
552 (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);
553
554 usb_submit_urb(mcs->led_urb, GFP_ATOMIC);
555 }
556
557 static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
558 __u16 val)
559 {
560 struct usb_device *dev = port->serial->dev;
561
562 usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
563 val, reg, NULL, 0, MOS_WDR_TIMEOUT);
564 }
565
566 static void mos7840_led_off(struct timer_list *t)
567 {
568 struct moschip_port *mcs = from_timer(mcs, t, led_timer1);
569
570 /* Turn off LED */
571 mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
572 mod_timer(&mcs->led_timer2,
573 jiffies + msecs_to_jiffies(LED_OFF_MS));
574 }
575
576 static void mos7840_led_flag_off(struct timer_list *t)
577 {
578 struct moschip_port *mcs = from_timer(mcs, t, led_timer2);
579
580 clear_bit_unlock(MOS7840_FLAG_LED_BUSY, &mcs->flags);
581 }
582
583 static void mos7840_led_activity(struct usb_serial_port *port)
584 {
585 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
586
587 if (test_and_set_bit_lock(MOS7840_FLAG_LED_BUSY, &mos7840_port->flags))
588 return;
589
590 mos7840_set_led_async(mos7840_port, 0x0301, MODEM_CONTROL_REGISTER);
591 mod_timer(&mos7840_port->led_timer1,
592 jiffies + msecs_to_jiffies(LED_ON_MS));
593 }
594
595 /*****************************************************************************
596 * mos7840_interrupt_callback
597 * this is the callback function for when we have received data on the
598 * interrupt endpoint.
599 *****************************************************************************/
600
601 static void mos7840_interrupt_callback(struct urb *urb)
602 {
603 int result;
604 int length;
605 struct moschip_port *mos7840_port;
606 struct usb_serial *serial;
607 __u16 Data;
608 unsigned char *data;
609 __u8 sp[5], st;
610 int i, rv = 0;
611 __u16 wval, wreg = 0;
612 int status = urb->status;
613
614 switch (status) {
615 case 0:
616 /* success */
617 break;
618 case -ECONNRESET:
619 case -ENOENT:
620 case -ESHUTDOWN:
621 /* this urb is terminated, clean up */
622 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n",
623 __func__, status);
624 return;
625 default:
626 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n",
627 __func__, status);
628 goto exit;
629 }
630
631 length = urb->actual_length;
632 data = urb->transfer_buffer;
633
634 serial = urb->context;
635
636 /* Moschip get 5 bytes
637 * Byte 1 IIR Port 1 (port.number is 0)
638 * Byte 2 IIR Port 2 (port.number is 1)
639 * Byte 3 IIR Port 3 (port.number is 2)
640 * Byte 4 IIR Port 4 (port.number is 3)
641 * Byte 5 FIFO status for both */
642
643 if (length > 5) {
644 dev_dbg(&urb->dev->dev, "%s", "Wrong data !!!\n");
645 return;
646 }
647
648 sp[0] = (__u8) data[0];
649 sp[1] = (__u8) data[1];
650 sp[2] = (__u8) data[2];
651 sp[3] = (__u8) data[3];
652 st = (__u8) data[4];
653
654 for (i = 0; i < serial->num_ports; i++) {
655 mos7840_port = mos7840_get_port_private(serial->port[i]);
656 wval = ((__u16)serial->port[i]->port_number + 1) << 8;
657 if (mos7840_port->open) {
658 if (sp[i] & 0x01) {
659 dev_dbg(&urb->dev->dev, "SP%d No Interrupt !!!\n", i);
660 } else {
661 switch (sp[i] & 0x0f) {
662 case SERIAL_IIR_RLS:
663 dev_dbg(&urb->dev->dev, "Serial Port %d: Receiver status error or \n", i);
664 dev_dbg(&urb->dev->dev, "address bit detected in 9-bit mode\n");
665 mos7840_port->MsrLsr = 1;
666 wreg = LINE_STATUS_REGISTER;
667 break;
668 case SERIAL_IIR_MS:
669 dev_dbg(&urb->dev->dev, "Serial Port %d: Modem status change\n", i);
670 mos7840_port->MsrLsr = 0;
671 wreg = MODEM_STATUS_REGISTER;
672 break;
673 }
674 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
675 }
676 }
677 }
678 if (!(rv < 0))
679 /* the completion handler for the control urb will resubmit */
680 return;
681 exit:
682 result = usb_submit_urb(urb, GFP_ATOMIC);
683 if (result) {
684 dev_err(&urb->dev->dev,
685 "%s - Error %d submitting interrupt urb\n",
686 __func__, result);
687 }
688 }
689
690 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
691 const char *function)
692 {
693 if (!port) {
694 pr_debug("%s - port == NULL\n", function);
695 return -1;
696 }
697 if (!port->serial) {
698 pr_debug("%s - port->serial == NULL\n", function);
699 return -1;
700 }
701
702 return 0;
703 }
704
705 /* Inline functions to check the sanity of a pointer that is passed to us */
706 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
707 const char *function)
708 {
709 if (!serial) {
710 pr_debug("%s - serial == NULL\n", function);
711 return -1;
712 }
713 if (!serial->type) {
714 pr_debug("%s - serial->type == NULL!\n", function);
715 return -1;
716 }
717
718 return 0;
719 }
720
721 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
722 const char *function)
723 {
724 /* if no port was specified, or it fails a paranoia check */
725 if (!port ||
726 mos7840_port_paranoia_check(port, function) ||
727 mos7840_serial_paranoia_check(port->serial, function)) {
728 /* then say that we don't have a valid usb_serial thing,
729 * which will end up genrating -ENODEV return values */
730 return NULL;
731 }
732
733 return port->serial;
734 }
735
736 /*****************************************************************************
737 * mos7840_bulk_in_callback
738 * this is the callback function for when we have received data on the
739 * bulk in endpoint.
740 *****************************************************************************/
741
742 static void mos7840_bulk_in_callback(struct urb *urb)
743 {
744 int retval;
745 unsigned char *data;
746 struct usb_serial *serial;
747 struct usb_serial_port *port;
748 struct moschip_port *mos7840_port;
749 int status = urb->status;
750
751 mos7840_port = urb->context;
752 if (!mos7840_port)
753 return;
754
755 if (status) {
756 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
757 mos7840_port->read_urb_busy = false;
758 return;
759 }
760
761 port = mos7840_port->port;
762 if (mos7840_port_paranoia_check(port, __func__)) {
763 mos7840_port->read_urb_busy = false;
764 return;
765 }
766
767 serial = mos7840_get_usb_serial(port, __func__);
768 if (!serial) {
769 mos7840_port->read_urb_busy = false;
770 return;
771 }
772
773 data = urb->transfer_buffer;
774 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
775
776 if (urb->actual_length) {
777 struct tty_port *tport = &mos7840_port->port->port;
778 tty_insert_flip_string(tport, data, urb->actual_length);
779 tty_flip_buffer_push(tport);
780 port->icount.rx += urb->actual_length;
781 dev_dbg(&port->dev, "icount.rx is %d:\n", port->icount.rx);
782 }
783
784 if (!mos7840_port->read_urb) {
785 dev_dbg(&port->dev, "%s", "URB KILLED !!!\n");
786 mos7840_port->read_urb_busy = false;
787 return;
788 }
789
790 if (mos7840_port->has_led)
791 mos7840_led_activity(port);
792
793 mos7840_port->read_urb_busy = true;
794 retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
795
796 if (retval) {
797 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
798 mos7840_port->read_urb_busy = false;
799 }
800 }
801
802 /*****************************************************************************
803 * mos7840_bulk_out_data_callback
804 * this is the callback function for when we have finished sending
805 * serial data on the bulk out endpoint.
806 *****************************************************************************/
807
808 static void mos7840_bulk_out_data_callback(struct urb *urb)
809 {
810 struct moschip_port *mos7840_port;
811 struct usb_serial_port *port;
812 int status = urb->status;
813 unsigned long flags;
814 int i;
815
816 mos7840_port = urb->context;
817 port = mos7840_port->port;
818 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
819 for (i = 0; i < NUM_URBS; i++) {
820 if (urb == mos7840_port->write_urb_pool[i]) {
821 mos7840_port->busy[i] = 0;
822 break;
823 }
824 }
825 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
826
827 if (status) {
828 dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status);
829 return;
830 }
831
832 if (mos7840_port_paranoia_check(port, __func__))
833 return;
834
835 if (mos7840_port->open)
836 tty_port_tty_wakeup(&port->port);
837
838 }
839
840 /************************************************************************/
841 /* D R I V E R T T Y I N T E R F A C E F U N C T I O N S */
842 /************************************************************************/
843
844 /*****************************************************************************
845 * mos7840_open
846 * this function is called by the tty driver when a port is opened
847 * If successful, we return 0
848 * Otherwise we return a negative error number.
849 *****************************************************************************/
850
851 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
852 {
853 int response;
854 int j;
855 struct usb_serial *serial;
856 struct urb *urb;
857 __u16 Data;
858 int status;
859 struct moschip_port *mos7840_port;
860 struct moschip_port *port0;
861
862 if (mos7840_port_paranoia_check(port, __func__))
863 return -ENODEV;
864
865 serial = port->serial;
866
867 if (mos7840_serial_paranoia_check(serial, __func__))
868 return -ENODEV;
869
870 mos7840_port = mos7840_get_port_private(port);
871 port0 = mos7840_get_port_private(serial->port[0]);
872
873 if (mos7840_port == NULL || port0 == NULL)
874 return -ENODEV;
875
876 usb_clear_halt(serial->dev, port->write_urb->pipe);
877 usb_clear_halt(serial->dev, port->read_urb->pipe);
878 port0->open_ports++;
879
880 /* Initialising the write urb pool */
881 for (j = 0; j < NUM_URBS; ++j) {
882 urb = usb_alloc_urb(0, GFP_KERNEL);
883 mos7840_port->write_urb_pool[j] = urb;
884 if (!urb)
885 continue;
886
887 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
888 GFP_KERNEL);
889 if (!urb->transfer_buffer) {
890 usb_free_urb(urb);
891 mos7840_port->write_urb_pool[j] = NULL;
892 continue;
893 }
894 }
895
896 /*****************************************************************************
897 * Initialize MCS7840 -- Write Init values to corresponding Registers
898 *
899 * Register Index
900 * 1 : IER
901 * 2 : FCR
902 * 3 : LCR
903 * 4 : MCR
904 *
905 * 0x08 : SP1/2 Control Reg
906 *****************************************************************************/
907
908 /* NEED to check the following Block */
909
910 Data = 0x0;
911 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
912 if (status < 0) {
913 dev_dbg(&port->dev, "Reading Spreg failed\n");
914 goto err;
915 }
916 Data |= 0x80;
917 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
918 if (status < 0) {
919 dev_dbg(&port->dev, "writing Spreg failed\n");
920 goto err;
921 }
922
923 Data &= ~0x80;
924 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
925 if (status < 0) {
926 dev_dbg(&port->dev, "writing Spreg failed\n");
927 goto err;
928 }
929 /* End of block to be checked */
930
931 Data = 0x0;
932 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
933 &Data);
934 if (status < 0) {
935 dev_dbg(&port->dev, "Reading Controlreg failed\n");
936 goto err;
937 }
938 Data |= 0x08; /* Driver done bit */
939 Data |= 0x20; /* rx_disable */
940 status = mos7840_set_reg_sync(port,
941 mos7840_port->ControlRegOffset, Data);
942 if (status < 0) {
943 dev_dbg(&port->dev, "writing Controlreg failed\n");
944 goto err;
945 }
946 /* do register settings here */
947 /* Set all regs to the device default values. */
948 /***********************************
949 * First Disable all interrupts.
950 ***********************************/
951 Data = 0x00;
952 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
953 if (status < 0) {
954 dev_dbg(&port->dev, "disabling interrupts failed\n");
955 goto err;
956 }
957 /* Set FIFO_CONTROL_REGISTER to the default value */
958 Data = 0x00;
959 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
960 if (status < 0) {
961 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER failed\n");
962 goto err;
963 }
964
965 Data = 0xcf;
966 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
967 if (status < 0) {
968 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER failed\n");
969 goto err;
970 }
971
972 Data = 0x03;
973 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
974 mos7840_port->shadowLCR = Data;
975
976 Data = 0x0b;
977 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
978 mos7840_port->shadowMCR = Data;
979
980 Data = 0x00;
981 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
982 mos7840_port->shadowLCR = Data;
983
984 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
985 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
986
987 Data = 0x0c;
988 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
989
990 Data = 0x0;
991 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
992
993 Data = 0x00;
994 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
995
996 Data = Data & ~SERIAL_LCR_DLAB;
997 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
998 mos7840_port->shadowLCR = Data;
999
1000 /* clearing Bulkin and Bulkout Fifo */
1001 Data = 0x0;
1002 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1003
1004 Data = Data | 0x0c;
1005 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1006
1007 Data = Data & ~0x0c;
1008 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1009 /* Finally enable all interrupts */
1010 Data = 0x0c;
1011 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1012
1013 /* clearing rx_disable */
1014 Data = 0x0;
1015 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1016 &Data);
1017 Data = Data & ~0x20;
1018 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1019 Data);
1020
1021 /* rx_negate */
1022 Data = 0x0;
1023 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1024 &Data);
1025 Data = Data | 0x10;
1026 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1027 Data);
1028
1029 /* Check to see if we've set up our endpoint info yet *
1030 * (can't set it up in mos7840_startup as the structures *
1031 * were not set up at that time.) */
1032 if (port0->open_ports == 1) {
1033 /* FIXME: Buffer never NULL, so URB is not submitted. */
1034 if (serial->port[0]->interrupt_in_buffer == NULL) {
1035 /* set up interrupt urb */
1036 usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1037 serial->dev,
1038 usb_rcvintpipe(serial->dev,
1039 serial->port[0]->interrupt_in_endpointAddress),
1040 serial->port[0]->interrupt_in_buffer,
1041 serial->port[0]->interrupt_in_urb->
1042 transfer_buffer_length,
1043 mos7840_interrupt_callback,
1044 serial,
1045 serial->port[0]->interrupt_in_urb->interval);
1046
1047 /* start interrupt read for mos7840 */
1048 response =
1049 usb_submit_urb(serial->port[0]->interrupt_in_urb,
1050 GFP_KERNEL);
1051 if (response) {
1052 dev_err(&port->dev, "%s - Error %d submitting "
1053 "interrupt urb\n", __func__, response);
1054 }
1055
1056 }
1057
1058 }
1059
1060 /* see if we've set up our endpoint info yet *
1061 * (can't set it up in mos7840_startup as the *
1062 * structures were not set up at that time.) */
1063
1064 dev_dbg(&port->dev, "port number is %d\n", port->port_number);
1065 dev_dbg(&port->dev, "minor number is %d\n", port->minor);
1066 dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
1067 dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress);
1068 dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress);
1069 dev_dbg(&port->dev, "port's number in the device is %d\n", mos7840_port->port_num);
1070 mos7840_port->read_urb = port->read_urb;
1071
1072 /* set up our bulk in urb */
1073 if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
1074 usb_fill_bulk_urb(mos7840_port->read_urb,
1075 serial->dev,
1076 usb_rcvbulkpipe(serial->dev,
1077 (port->bulk_in_endpointAddress) + 2),
1078 port->bulk_in_buffer,
1079 mos7840_port->read_urb->transfer_buffer_length,
1080 mos7840_bulk_in_callback, mos7840_port);
1081 } else {
1082 usb_fill_bulk_urb(mos7840_port->read_urb,
1083 serial->dev,
1084 usb_rcvbulkpipe(serial->dev,
1085 port->bulk_in_endpointAddress),
1086 port->bulk_in_buffer,
1087 mos7840_port->read_urb->transfer_buffer_length,
1088 mos7840_bulk_in_callback, mos7840_port);
1089 }
1090
1091 dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress);
1092 mos7840_port->read_urb_busy = true;
1093 response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1094 if (response) {
1095 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1096 __func__, response);
1097 mos7840_port->read_urb_busy = false;
1098 }
1099
1100 /* initialize our port settings */
1101 /* Must set to enable ints! */
1102 mos7840_port->shadowMCR = MCR_MASTER_IE;
1103 /* send a open port command */
1104 mos7840_port->open = 1;
1105 /* mos7840_change_port_settings(mos7840_port,old_termios); */
1106
1107 return 0;
1108 err:
1109 for (j = 0; j < NUM_URBS; ++j) {
1110 urb = mos7840_port->write_urb_pool[j];
1111 if (!urb)
1112 continue;
1113 kfree(urb->transfer_buffer);
1114 usb_free_urb(urb);
1115 }
1116 return status;
1117 }
1118
1119 /*****************************************************************************
1120 * mos7840_chars_in_buffer
1121 * this function is called by the tty driver when it wants to know how many
1122 * bytes of data we currently have outstanding in the port (data that has
1123 * been written, but hasn't made it out the port yet)
1124 * If successful, we return the number of bytes left to be written in the
1125 * system,
1126 * Otherwise we return zero.
1127 *****************************************************************************/
1128
1129 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1130 {
1131 struct usb_serial_port *port = tty->driver_data;
1132 int i;
1133 int chars = 0;
1134 unsigned long flags;
1135 struct moschip_port *mos7840_port;
1136
1137 if (mos7840_port_paranoia_check(port, __func__))
1138 return 0;
1139
1140 mos7840_port = mos7840_get_port_private(port);
1141 if (mos7840_port == NULL)
1142 return 0;
1143
1144 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1145 for (i = 0; i < NUM_URBS; ++i) {
1146 if (mos7840_port->busy[i]) {
1147 struct urb *urb = mos7840_port->write_urb_pool[i];
1148 chars += urb->transfer_buffer_length;
1149 }
1150 }
1151 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1152 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1153 return chars;
1154
1155 }
1156
1157 /*****************************************************************************
1158 * mos7840_close
1159 * this function is called by the tty driver when a port is closed
1160 *****************************************************************************/
1161
1162 static void mos7840_close(struct usb_serial_port *port)
1163 {
1164 struct usb_serial *serial;
1165 struct moschip_port *mos7840_port;
1166 struct moschip_port *port0;
1167 int j;
1168 __u16 Data;
1169
1170 if (mos7840_port_paranoia_check(port, __func__))
1171 return;
1172
1173 serial = mos7840_get_usb_serial(port, __func__);
1174 if (!serial)
1175 return;
1176
1177 mos7840_port = mos7840_get_port_private(port);
1178 port0 = mos7840_get_port_private(serial->port[0]);
1179
1180 if (mos7840_port == NULL || port0 == NULL)
1181 return;
1182
1183 for (j = 0; j < NUM_URBS; ++j)
1184 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1185
1186 /* Freeing Write URBs */
1187 for (j = 0; j < NUM_URBS; ++j) {
1188 if (mos7840_port->write_urb_pool[j]) {
1189 kfree(mos7840_port->write_urb_pool[j]->transfer_buffer);
1190 usb_free_urb(mos7840_port->write_urb_pool[j]);
1191 }
1192 }
1193
1194 usb_kill_urb(mos7840_port->read_urb);
1195 mos7840_port->read_urb_busy = false;
1196
1197 port0->open_ports--;
1198 dev_dbg(&port->dev, "%s in close%d\n", __func__, port0->open_ports);
1199 if (port0->open_ports == 0) {
1200 if (serial->port[0]->interrupt_in_urb) {
1201 dev_dbg(&port->dev, "Shutdown interrupt_in_urb\n");
1202 usb_kill_urb(serial->port[0]->interrupt_in_urb);
1203 }
1204 }
1205
1206 Data = 0x0;
1207 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1208
1209 Data = 0x00;
1210 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1211
1212 mos7840_port->open = 0;
1213 }
1214
1215 /*****************************************************************************
1216 * mos7840_break
1217 * this function sends a break to the port
1218 *****************************************************************************/
1219 static void mos7840_break(struct tty_struct *tty, int break_state)
1220 {
1221 struct usb_serial_port *port = tty->driver_data;
1222 unsigned char data;
1223 struct usb_serial *serial;
1224 struct moschip_port *mos7840_port;
1225
1226 if (mos7840_port_paranoia_check(port, __func__))
1227 return;
1228
1229 serial = mos7840_get_usb_serial(port, __func__);
1230 if (!serial)
1231 return;
1232
1233 mos7840_port = mos7840_get_port_private(port);
1234
1235 if (mos7840_port == NULL)
1236 return;
1237
1238 if (break_state == -1)
1239 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1240 else
1241 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1242
1243 /* FIXME: no locking on shadowLCR anywhere in driver */
1244 mos7840_port->shadowLCR = data;
1245 dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1246 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1247 mos7840_port->shadowLCR);
1248 }
1249
1250 /*****************************************************************************
1251 * mos7840_write_room
1252 * this function is called by the tty driver when it wants to know how many
1253 * bytes of data we can accept for a specific port.
1254 * If successful, we return the amount of room that we have for this port
1255 * Otherwise we return a negative error number.
1256 *****************************************************************************/
1257
1258 static int mos7840_write_room(struct tty_struct *tty)
1259 {
1260 struct usb_serial_port *port = tty->driver_data;
1261 int i;
1262 int room = 0;
1263 unsigned long flags;
1264 struct moschip_port *mos7840_port;
1265
1266 if (mos7840_port_paranoia_check(port, __func__))
1267 return -1;
1268
1269 mos7840_port = mos7840_get_port_private(port);
1270 if (mos7840_port == NULL)
1271 return -1;
1272
1273 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1274 for (i = 0; i < NUM_URBS; ++i) {
1275 if (!mos7840_port->busy[i])
1276 room += URB_TRANSFER_BUFFER_SIZE;
1277 }
1278 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1279
1280 room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1281 dev_dbg(&mos7840_port->port->dev, "%s - returns %d\n", __func__, room);
1282 return room;
1283
1284 }
1285
1286 /*****************************************************************************
1287 * mos7840_write
1288 * this function is called by the tty driver when data should be written to
1289 * the port.
1290 * If successful, we return the number of bytes written, otherwise we
1291 * return a negative error number.
1292 *****************************************************************************/
1293
1294 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1295 const unsigned char *data, int count)
1296 {
1297 int status;
1298 int i;
1299 int bytes_sent = 0;
1300 int transfer_size;
1301 unsigned long flags;
1302
1303 struct moschip_port *mos7840_port;
1304 struct usb_serial *serial;
1305 struct urb *urb;
1306 /* __u16 Data; */
1307 const unsigned char *current_position = data;
1308 unsigned char *data1;
1309
1310 if (mos7840_port_paranoia_check(port, __func__))
1311 return -1;
1312
1313 serial = port->serial;
1314 if (mos7840_serial_paranoia_check(serial, __func__))
1315 return -1;
1316
1317 mos7840_port = mos7840_get_port_private(port);
1318 if (mos7840_port == NULL)
1319 return -1;
1320
1321 /* try to find a free urb in the list */
1322 urb = NULL;
1323
1324 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1325 for (i = 0; i < NUM_URBS; ++i) {
1326 if (!mos7840_port->busy[i]) {
1327 mos7840_port->busy[i] = 1;
1328 urb = mos7840_port->write_urb_pool[i];
1329 dev_dbg(&port->dev, "URB:%d\n", i);
1330 break;
1331 }
1332 }
1333 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1334
1335 if (urb == NULL) {
1336 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1337 goto exit;
1338 }
1339
1340 if (urb->transfer_buffer == NULL) {
1341 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1342 GFP_ATOMIC);
1343 if (!urb->transfer_buffer)
1344 goto exit;
1345 }
1346 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1347
1348 memcpy(urb->transfer_buffer, current_position, transfer_size);
1349
1350 /* fill urb with data and submit */
1351 if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
1352 usb_fill_bulk_urb(urb,
1353 serial->dev,
1354 usb_sndbulkpipe(serial->dev,
1355 (port->bulk_out_endpointAddress) + 2),
1356 urb->transfer_buffer,
1357 transfer_size,
1358 mos7840_bulk_out_data_callback, mos7840_port);
1359 } else {
1360 usb_fill_bulk_urb(urb,
1361 serial->dev,
1362 usb_sndbulkpipe(serial->dev,
1363 port->bulk_out_endpointAddress),
1364 urb->transfer_buffer,
1365 transfer_size,
1366 mos7840_bulk_out_data_callback, mos7840_port);
1367 }
1368
1369 data1 = urb->transfer_buffer;
1370 dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress);
1371
1372 if (mos7840_port->has_led)
1373 mos7840_led_activity(port);
1374
1375 /* send it down the pipe */
1376 status = usb_submit_urb(urb, GFP_ATOMIC);
1377
1378 if (status) {
1379 mos7840_port->busy[i] = 0;
1380 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1381 "with status = %d\n", __func__, status);
1382 bytes_sent = status;
1383 goto exit;
1384 }
1385 bytes_sent = transfer_size;
1386 port->icount.tx += transfer_size;
1387 dev_dbg(&port->dev, "icount.tx is %d:\n", port->icount.tx);
1388 exit:
1389 return bytes_sent;
1390
1391 }
1392
1393 /*****************************************************************************
1394 * mos7840_throttle
1395 * this function is called by the tty driver when it wants to stop the data
1396 * being read from the port.
1397 *****************************************************************************/
1398
1399 static void mos7840_throttle(struct tty_struct *tty)
1400 {
1401 struct usb_serial_port *port = tty->driver_data;
1402 struct moschip_port *mos7840_port;
1403 int status;
1404
1405 if (mos7840_port_paranoia_check(port, __func__))
1406 return;
1407
1408 mos7840_port = mos7840_get_port_private(port);
1409
1410 if (mos7840_port == NULL)
1411 return;
1412
1413 if (!mos7840_port->open) {
1414 dev_dbg(&port->dev, "%s", "port not opened\n");
1415 return;
1416 }
1417
1418 /* if we are implementing XON/XOFF, send the stop character */
1419 if (I_IXOFF(tty)) {
1420 unsigned char stop_char = STOP_CHAR(tty);
1421 status = mos7840_write(tty, port, &stop_char, 1);
1422 if (status <= 0)
1423 return;
1424 }
1425 /* if we are implementing RTS/CTS, toggle that line */
1426 if (C_CRTSCTS(tty)) {
1427 mos7840_port->shadowMCR &= ~MCR_RTS;
1428 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1429 mos7840_port->shadowMCR);
1430 if (status < 0)
1431 return;
1432 }
1433 }
1434
1435 /*****************************************************************************
1436 * mos7840_unthrottle
1437 * this function is called by the tty driver when it wants to resume
1438 * the data being read from the port (called after mos7840_throttle is
1439 * called)
1440 *****************************************************************************/
1441 static void mos7840_unthrottle(struct tty_struct *tty)
1442 {
1443 struct usb_serial_port *port = tty->driver_data;
1444 int status;
1445 struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1446
1447 if (mos7840_port_paranoia_check(port, __func__))
1448 return;
1449
1450 if (mos7840_port == NULL)
1451 return;
1452
1453 if (!mos7840_port->open) {
1454 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1455 return;
1456 }
1457
1458 /* if we are implementing XON/XOFF, send the start character */
1459 if (I_IXOFF(tty)) {
1460 unsigned char start_char = START_CHAR(tty);
1461 status = mos7840_write(tty, port, &start_char, 1);
1462 if (status <= 0)
1463 return;
1464 }
1465
1466 /* if we are implementing RTS/CTS, toggle that line */
1467 if (C_CRTSCTS(tty)) {
1468 mos7840_port->shadowMCR |= MCR_RTS;
1469 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1470 mos7840_port->shadowMCR);
1471 if (status < 0)
1472 return;
1473 }
1474 }
1475
1476 static int mos7840_tiocmget(struct tty_struct *tty)
1477 {
1478 struct usb_serial_port *port = tty->driver_data;
1479 struct moschip_port *mos7840_port;
1480 unsigned int result;
1481 __u16 msr;
1482 __u16 mcr;
1483 int status;
1484 mos7840_port = mos7840_get_port_private(port);
1485
1486 if (mos7840_port == NULL)
1487 return -ENODEV;
1488
1489 status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1490 if (status < 0)
1491 return -EIO;
1492 status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1493 if (status < 0)
1494 return -EIO;
1495 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1496 | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1497 | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1498 | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1499 | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1500 | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1501 | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1502
1503 dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result);
1504
1505 return result;
1506 }
1507
1508 static int mos7840_tiocmset(struct tty_struct *tty,
1509 unsigned int set, unsigned int clear)
1510 {
1511 struct usb_serial_port *port = tty->driver_data;
1512 struct moschip_port *mos7840_port;
1513 unsigned int mcr;
1514 int status;
1515
1516 mos7840_port = mos7840_get_port_private(port);
1517
1518 if (mos7840_port == NULL)
1519 return -ENODEV;
1520
1521 /* FIXME: What locks the port registers ? */
1522 mcr = mos7840_port->shadowMCR;
1523 if (clear & TIOCM_RTS)
1524 mcr &= ~MCR_RTS;
1525 if (clear & TIOCM_DTR)
1526 mcr &= ~MCR_DTR;
1527 if (clear & TIOCM_LOOP)
1528 mcr &= ~MCR_LOOPBACK;
1529
1530 if (set & TIOCM_RTS)
1531 mcr |= MCR_RTS;
1532 if (set & TIOCM_DTR)
1533 mcr |= MCR_DTR;
1534 if (set & TIOCM_LOOP)
1535 mcr |= MCR_LOOPBACK;
1536
1537 mos7840_port->shadowMCR = mcr;
1538
1539 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1540 if (status < 0) {
1541 dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n");
1542 return status;
1543 }
1544
1545 return 0;
1546 }
1547
1548 /*****************************************************************************
1549 * mos7840_calc_baud_rate_divisor
1550 * this function calculates the proper baud rate divisor for the specified
1551 * baud rate.
1552 *****************************************************************************/
1553 static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port,
1554 int baudRate, int *divisor,
1555 __u16 *clk_sel_val)
1556 {
1557 dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate);
1558
1559 if (baudRate <= 115200) {
1560 *divisor = 115200 / baudRate;
1561 *clk_sel_val = 0x0;
1562 }
1563 if ((baudRate > 115200) && (baudRate <= 230400)) {
1564 *divisor = 230400 / baudRate;
1565 *clk_sel_val = 0x10;
1566 } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1567 *divisor = 403200 / baudRate;
1568 *clk_sel_val = 0x20;
1569 } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1570 *divisor = 460800 / baudRate;
1571 *clk_sel_val = 0x30;
1572 } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1573 *divisor = 806400 / baudRate;
1574 *clk_sel_val = 0x40;
1575 } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1576 *divisor = 921600 / baudRate;
1577 *clk_sel_val = 0x50;
1578 } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1579 *divisor = 1572864 / baudRate;
1580 *clk_sel_val = 0x60;
1581 } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1582 *divisor = 3145728 / baudRate;
1583 *clk_sel_val = 0x70;
1584 }
1585 return 0;
1586 }
1587
1588 /*****************************************************************************
1589 * mos7840_send_cmd_write_baud_rate
1590 * this function sends the proper command to change the baud rate of the
1591 * specified port.
1592 *****************************************************************************/
1593
1594 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1595 int baudRate)
1596 {
1597 int divisor = 0;
1598 int status;
1599 __u16 Data;
1600 unsigned char number;
1601 __u16 clk_sel_val;
1602 struct usb_serial_port *port;
1603
1604 if (mos7840_port == NULL)
1605 return -1;
1606
1607 port = mos7840_port->port;
1608 if (mos7840_port_paranoia_check(port, __func__))
1609 return -1;
1610
1611 if (mos7840_serial_paranoia_check(port->serial, __func__))
1612 return -1;
1613
1614 number = mos7840_port->port->port_number;
1615
1616 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudRate);
1617 /* reset clk_uart_sel in spregOffset */
1618 if (baudRate > 115200) {
1619 #ifdef HW_flow_control
1620 /* NOTE: need to see the pther register to modify */
1621 /* setting h/w flow control bit to 1 */
1622 Data = 0x2b;
1623 mos7840_port->shadowMCR = Data;
1624 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1625 Data);
1626 if (status < 0) {
1627 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1628 return -1;
1629 }
1630 #endif
1631
1632 } else {
1633 #ifdef HW_flow_control
1634 /* setting h/w flow control bit to 0 */
1635 Data = 0xb;
1636 mos7840_port->shadowMCR = Data;
1637 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1638 Data);
1639 if (status < 0) {
1640 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1641 return -1;
1642 }
1643 #endif
1644
1645 }
1646
1647 if (1) { /* baudRate <= 115200) */
1648 clk_sel_val = 0x0;
1649 Data = 0x0;
1650 status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor,
1651 &clk_sel_val);
1652 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1653 &Data);
1654 if (status < 0) {
1655 dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n");
1656 return -1;
1657 }
1658 Data = (Data & 0x8f) | clk_sel_val;
1659 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1660 Data);
1661 if (status < 0) {
1662 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1663 return -1;
1664 }
1665 /* Calculate the Divisor */
1666
1667 if (status) {
1668 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1669 return status;
1670 }
1671 /* Enable access to divisor latch */
1672 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1673 mos7840_port->shadowLCR = Data;
1674 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1675
1676 /* Write the divisor */
1677 Data = (unsigned char)(divisor & 0xff);
1678 dev_dbg(&port->dev, "set_serial_baud Value to write DLL is %x\n", Data);
1679 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1680
1681 Data = (unsigned char)((divisor & 0xff00) >> 8);
1682 dev_dbg(&port->dev, "set_serial_baud Value to write DLM is %x\n", Data);
1683 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1684
1685 /* Disable access to divisor latch */
1686 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1687 mos7840_port->shadowLCR = Data;
1688 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1689
1690 }
1691 return status;
1692 }
1693
1694 /*****************************************************************************
1695 * mos7840_change_port_settings
1696 * This routine is called to set the UART on the device to match
1697 * the specified new settings.
1698 *****************************************************************************/
1699
1700 static void mos7840_change_port_settings(struct tty_struct *tty,
1701 struct moschip_port *mos7840_port, struct ktermios *old_termios)
1702 {
1703 int baud;
1704 unsigned cflag;
1705 unsigned iflag;
1706 __u8 lData;
1707 __u8 lParity;
1708 __u8 lStop;
1709 int status;
1710 __u16 Data;
1711 struct usb_serial_port *port;
1712 struct usb_serial *serial;
1713
1714 if (mos7840_port == NULL)
1715 return;
1716
1717 port = mos7840_port->port;
1718
1719 if (mos7840_port_paranoia_check(port, __func__))
1720 return;
1721
1722 if (mos7840_serial_paranoia_check(port->serial, __func__))
1723 return;
1724
1725 serial = port->serial;
1726
1727 if (!mos7840_port->open) {
1728 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1729 return;
1730 }
1731
1732 lData = LCR_BITS_8;
1733 lStop = LCR_STOP_1;
1734 lParity = LCR_PAR_NONE;
1735
1736 cflag = tty->termios.c_cflag;
1737 iflag = tty->termios.c_iflag;
1738
1739 /* Change the number of bits */
1740 switch (cflag & CSIZE) {
1741 case CS5:
1742 lData = LCR_BITS_5;
1743 break;
1744
1745 case CS6:
1746 lData = LCR_BITS_6;
1747 break;
1748
1749 case CS7:
1750 lData = LCR_BITS_7;
1751 break;
1752
1753 default:
1754 case CS8:
1755 lData = LCR_BITS_8;
1756 break;
1757 }
1758
1759 /* Change the Parity bit */
1760 if (cflag & PARENB) {
1761 if (cflag & PARODD) {
1762 lParity = LCR_PAR_ODD;
1763 dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1764 } else {
1765 lParity = LCR_PAR_EVEN;
1766 dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1767 }
1768
1769 } else {
1770 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1771 }
1772
1773 if (cflag & CMSPAR)
1774 lParity = lParity | 0x20;
1775
1776 /* Change the Stop bit */
1777 if (cflag & CSTOPB) {
1778 lStop = LCR_STOP_2;
1779 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1780 } else {
1781 lStop = LCR_STOP_1;
1782 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1783 }
1784
1785 /* Update the LCR with the correct value */
1786 mos7840_port->shadowLCR &=
1787 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1788 mos7840_port->shadowLCR |= (lData | lParity | lStop);
1789
1790 dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__,
1791 mos7840_port->shadowLCR);
1792 /* Disable Interrupts */
1793 Data = 0x00;
1794 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1795
1796 Data = 0x00;
1797 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1798
1799 Data = 0xcf;
1800 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1801
1802 /* Send the updated LCR value to the mos7840 */
1803 Data = mos7840_port->shadowLCR;
1804
1805 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1806
1807 Data = 0x00b;
1808 mos7840_port->shadowMCR = Data;
1809 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1810 Data = 0x00b;
1811 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1812
1813 /* set up the MCR register and send it to the mos7840 */
1814
1815 mos7840_port->shadowMCR = MCR_MASTER_IE;
1816 if (cflag & CBAUD)
1817 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
1818
1819 if (cflag & CRTSCTS)
1820 mos7840_port->shadowMCR |= (MCR_XON_ANY);
1821 else
1822 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
1823
1824 Data = mos7840_port->shadowMCR;
1825 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1826
1827 /* Determine divisor based on baud rate */
1828 baud = tty_get_baud_rate(tty);
1829
1830 if (!baud) {
1831 /* pick a default, any default... */
1832 dev_dbg(&port->dev, "%s", "Picked default baud...\n");
1833 baud = 9600;
1834 }
1835
1836 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1837 status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
1838
1839 /* Enable Interrupts */
1840 Data = 0x0c;
1841 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1842
1843 if (!mos7840_port->read_urb_busy) {
1844 mos7840_port->read_urb_busy = true;
1845 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1846 if (status) {
1847 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1848 status);
1849 mos7840_port->read_urb_busy = false;
1850 }
1851 }
1852 dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__,
1853 mos7840_port->shadowLCR);
1854 }
1855
1856 /*****************************************************************************
1857 * mos7840_set_termios
1858 * this function is called by the tty driver when it wants to change
1859 * the termios structure
1860 *****************************************************************************/
1861
1862 static void mos7840_set_termios(struct tty_struct *tty,
1863 struct usb_serial_port *port,
1864 struct ktermios *old_termios)
1865 {
1866 int status;
1867 struct usb_serial *serial;
1868 struct moschip_port *mos7840_port;
1869
1870 if (mos7840_port_paranoia_check(port, __func__))
1871 return;
1872
1873 serial = port->serial;
1874
1875 if (mos7840_serial_paranoia_check(serial, __func__))
1876 return;
1877
1878 mos7840_port = mos7840_get_port_private(port);
1879
1880 if (mos7840_port == NULL)
1881 return;
1882
1883 if (!mos7840_port->open) {
1884 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1885 return;
1886 }
1887
1888 /* change the port settings to the new ones specified */
1889
1890 mos7840_change_port_settings(tty, mos7840_port, old_termios);
1891
1892 if (!mos7840_port->read_urb) {
1893 dev_dbg(&port->dev, "%s", "URB KILLED !!!!!\n");
1894 return;
1895 }
1896
1897 if (!mos7840_port->read_urb_busy) {
1898 mos7840_port->read_urb_busy = true;
1899 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1900 if (status) {
1901 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1902 status);
1903 mos7840_port->read_urb_busy = false;
1904 }
1905 }
1906 }
1907
1908 /*****************************************************************************
1909 * mos7840_get_lsr_info - get line status register info
1910 *
1911 * Purpose: Let user call ioctl() to get info when the UART physically
1912 * is emptied. On bus types like RS485, the transmitter must
1913 * release the bus after transmitting. This must be done when
1914 * the transmit shift register is empty, not be done when the
1915 * transmit holding register is empty. This functionality
1916 * allows an RS485 driver to be written in user space.
1917 *****************************************************************************/
1918
1919 static int mos7840_get_lsr_info(struct tty_struct *tty,
1920 unsigned int __user *value)
1921 {
1922 int count;
1923 unsigned int result = 0;
1924
1925 count = mos7840_chars_in_buffer(tty);
1926 if (count == 0)
1927 result = TIOCSER_TEMT;
1928
1929 if (copy_to_user(value, &result, sizeof(int)))
1930 return -EFAULT;
1931 return 0;
1932 }
1933
1934 /*****************************************************************************
1935 * mos7840_get_serial_info
1936 * function to get information about serial port
1937 *****************************************************************************/
1938
1939 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
1940 struct serial_struct __user *retinfo)
1941 {
1942 struct serial_struct tmp;
1943
1944 if (mos7840_port == NULL)
1945 return -1;
1946
1947 memset(&tmp, 0, sizeof(tmp));
1948
1949 tmp.type = PORT_16550A;
1950 tmp.line = mos7840_port->port->minor;
1951 tmp.port = mos7840_port->port->port_number;
1952 tmp.irq = 0;
1953 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
1954 tmp.baud_base = 9600;
1955 tmp.close_delay = 5 * HZ;
1956 tmp.closing_wait = 30 * HZ;
1957
1958 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1959 return -EFAULT;
1960 return 0;
1961 }
1962
1963 /*****************************************************************************
1964 * SerialIoctl
1965 * this function handles any ioctl calls to the driver
1966 *****************************************************************************/
1967
1968 static int mos7840_ioctl(struct tty_struct *tty,
1969 unsigned int cmd, unsigned long arg)
1970 {
1971 struct usb_serial_port *port = tty->driver_data;
1972 void __user *argp = (void __user *)arg;
1973 struct moschip_port *mos7840_port;
1974
1975 if (mos7840_port_paranoia_check(port, __func__))
1976 return -1;
1977
1978 mos7840_port = mos7840_get_port_private(port);
1979
1980 if (mos7840_port == NULL)
1981 return -1;
1982
1983 switch (cmd) {
1984 /* return number of bytes available */
1985
1986 case TIOCSERGETLSR:
1987 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
1988 return mos7840_get_lsr_info(tty, argp);
1989
1990 case TIOCGSERIAL:
1991 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
1992 return mos7840_get_serial_info(mos7840_port, argp);
1993
1994 case TIOCSSERIAL:
1995 dev_dbg(&port->dev, "%s TIOCSSERIAL\n", __func__);
1996 break;
1997 default:
1998 break;
1999 }
2000 return -ENOIOCTLCMD;
2001 }
2002
2003 static int mos7810_check(struct usb_serial *serial)
2004 {
2005 int i, pass_count = 0;
2006 u8 *buf;
2007 __u16 data = 0, mcr_data = 0;
2008 __u16 test_pattern = 0x55AA;
2009 int res;
2010
2011 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
2012 if (!buf)
2013 return 0; /* failed to identify 7810 */
2014
2015 /* Store MCR setting */
2016 res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2017 MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
2018 buf, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2019 if (res == VENDOR_READ_LENGTH)
2020 mcr_data = *buf;
2021
2022 for (i = 0; i < 16; i++) {
2023 /* Send the 1-bit test pattern out to MCS7810 test pin */
2024 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2025 MCS_WRREQ, MCS_WR_RTYPE,
2026 (0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
2027 MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
2028
2029 /* Read the test pattern back */
2030 res = usb_control_msg(serial->dev,
2031 usb_rcvctrlpipe(serial->dev, 0), MCS_RDREQ,
2032 MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
2033 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2034 if (res == VENDOR_READ_LENGTH)
2035 data = *buf;
2036
2037 /* If this is a MCS7810 device, both test patterns must match */
2038 if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
2039 break;
2040
2041 pass_count++;
2042 }
2043
2044 /* Restore MCR setting */
2045 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
2046 MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
2047 0, MOS_WDR_TIMEOUT);
2048
2049 kfree(buf);
2050
2051 if (pass_count == 16)
2052 return 1;
2053
2054 return 0;
2055 }
2056
2057 static int mos7840_probe(struct usb_serial *serial,
2058 const struct usb_device_id *id)
2059 {
2060 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
2061 u16 vid = le16_to_cpu(serial->dev->descriptor.idVendor);
2062 u8 *buf;
2063 int device_type;
2064
2065 if (product == MOSCHIP_DEVICE_ID_7810 ||
2066 product == MOSCHIP_DEVICE_ID_7820) {
2067 device_type = product;
2068 goto out;
2069 }
2070
2071 if (vid == USB_VENDOR_ID_MOXA && product == MOXA_DEVICE_ID_2210) {
2072 device_type = MOSCHIP_DEVICE_ID_7820;
2073 goto out;
2074 }
2075
2076 buf = kzalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
2077 if (!buf)
2078 return -ENOMEM;
2079
2080 usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2081 MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
2082 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2083
2084 /* For a MCS7840 device GPIO0 must be set to 1 */
2085 if (buf[0] & 0x01)
2086 device_type = MOSCHIP_DEVICE_ID_7840;
2087 else if (mos7810_check(serial))
2088 device_type = MOSCHIP_DEVICE_ID_7810;
2089 else
2090 device_type = MOSCHIP_DEVICE_ID_7820;
2091
2092 kfree(buf);
2093 out:
2094 usb_set_serial_data(serial, (void *)(unsigned long)device_type);
2095
2096 return 0;
2097 }
2098
2099 static int mos7840_calc_num_ports(struct usb_serial *serial,
2100 struct usb_serial_endpoints *epds)
2101 {
2102 int device_type = (unsigned long)usb_get_serial_data(serial);
2103 int num_ports;
2104
2105 num_ports = (device_type >> 4) & 0x000F;
2106
2107 /*
2108 * num_ports is currently never zero as device_type is one of
2109 * MOSCHIP_DEVICE_ID_78{1,2,4}0.
2110 */
2111 if (num_ports == 0)
2112 return -ENODEV;
2113
2114 if (epds->num_bulk_in < num_ports || epds->num_bulk_out < num_ports) {
2115 dev_err(&serial->interface->dev, "missing endpoints\n");
2116 return -ENODEV;
2117 }
2118
2119 return num_ports;
2120 }
2121
2122 static int mos7840_port_probe(struct usb_serial_port *port)
2123 {
2124 struct usb_serial *serial = port->serial;
2125 int device_type = (unsigned long)usb_get_serial_data(serial);
2126 struct moschip_port *mos7840_port;
2127 int status;
2128 int pnum;
2129 __u16 Data;
2130
2131 /* we set up the pointers to the endpoints in the mos7840_open *
2132 * function, as the structures aren't created yet. */
2133
2134 pnum = port->port_number;
2135
2136 dev_dbg(&port->dev, "mos7840_startup: configuring port %d\n", pnum);
2137 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2138 if (!mos7840_port)
2139 return -ENOMEM;
2140
2141 /* Initialize all port interrupt end point to port 0 int
2142 * endpoint. Our device has only one interrupt end point
2143 * common to all port */
2144
2145 mos7840_port->port = port;
2146 mos7840_set_port_private(port, mos7840_port);
2147 spin_lock_init(&mos7840_port->pool_lock);
2148
2149 /* minor is not initialised until later by
2150 * usb-serial.c:get_free_serial() and cannot therefore be used
2151 * to index device instances */
2152 mos7840_port->port_num = pnum + 1;
2153 dev_dbg(&port->dev, "port->minor = %d\n", port->minor);
2154 dev_dbg(&port->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num);
2155
2156 if (mos7840_port->port_num == 1) {
2157 mos7840_port->SpRegOffset = 0x0;
2158 mos7840_port->ControlRegOffset = 0x1;
2159 mos7840_port->DcrRegOffset = 0x4;
2160 } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 4)) {
2161 mos7840_port->SpRegOffset = 0x8;
2162 mos7840_port->ControlRegOffset = 0x9;
2163 mos7840_port->DcrRegOffset = 0x16;
2164 } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 2)) {
2165 mos7840_port->SpRegOffset = 0xa;
2166 mos7840_port->ControlRegOffset = 0xb;
2167 mos7840_port->DcrRegOffset = 0x19;
2168 } else if ((mos7840_port->port_num == 3) && (serial->num_ports == 4)) {
2169 mos7840_port->SpRegOffset = 0xa;
2170 mos7840_port->ControlRegOffset = 0xb;
2171 mos7840_port->DcrRegOffset = 0x19;
2172 } else if ((mos7840_port->port_num == 4) && (serial->num_ports == 4)) {
2173 mos7840_port->SpRegOffset = 0xc;
2174 mos7840_port->ControlRegOffset = 0xd;
2175 mos7840_port->DcrRegOffset = 0x1c;
2176 }
2177 mos7840_dump_serial_port(port, mos7840_port);
2178 mos7840_set_port_private(port, mos7840_port);
2179
2180 /* enable rx_disable bit in control register */
2181 status = mos7840_get_reg_sync(port,
2182 mos7840_port->ControlRegOffset, &Data);
2183 if (status < 0) {
2184 dev_dbg(&port->dev, "Reading ControlReg failed status-0x%x\n", status);
2185 goto out;
2186 } else
2187 dev_dbg(&port->dev, "ControlReg Reading success val is %x, status%d\n", Data, status);
2188 Data |= 0x08; /* setting driver done bit */
2189 Data |= 0x04; /* sp1_bit to have cts change reflect in
2190 modem status reg */
2191
2192 /* Data |= 0x20; //rx_disable bit */
2193 status = mos7840_set_reg_sync(port,
2194 mos7840_port->ControlRegOffset, Data);
2195 if (status < 0) {
2196 dev_dbg(&port->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2197 goto out;
2198 } else
2199 dev_dbg(&port->dev, "ControlReg Writing success(rx_disable) status%d\n", status);
2200
2201 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2202 and 0x24 in DCR3 */
2203 Data = 0x01;
2204 status = mos7840_set_reg_sync(port,
2205 (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2206 if (status < 0) {
2207 dev_dbg(&port->dev, "Writing DCR0 failed status-0x%x\n", status);
2208 goto out;
2209 } else
2210 dev_dbg(&port->dev, "DCR0 Writing success status%d\n", status);
2211
2212 Data = 0x05;
2213 status = mos7840_set_reg_sync(port,
2214 (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2215 if (status < 0) {
2216 dev_dbg(&port->dev, "Writing DCR1 failed status-0x%x\n", status);
2217 goto out;
2218 } else
2219 dev_dbg(&port->dev, "DCR1 Writing success status%d\n", status);
2220
2221 Data = 0x24;
2222 status = mos7840_set_reg_sync(port,
2223 (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2224 if (status < 0) {
2225 dev_dbg(&port->dev, "Writing DCR2 failed status-0x%x\n", status);
2226 goto out;
2227 } else
2228 dev_dbg(&port->dev, "DCR2 Writing success status%d\n", status);
2229
2230 /* write values in clkstart0x0 and clkmulti 0x20 */
2231 Data = 0x0;
2232 status = mos7840_set_reg_sync(port, CLK_START_VALUE_REGISTER, Data);
2233 if (status < 0) {
2234 dev_dbg(&port->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2235 goto out;
2236 } else
2237 dev_dbg(&port->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2238
2239 Data = 0x20;
2240 status = mos7840_set_reg_sync(port, CLK_MULTI_REGISTER, Data);
2241 if (status < 0) {
2242 dev_dbg(&port->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status);
2243 goto error;
2244 } else
2245 dev_dbg(&port->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status);
2246
2247 /* write value 0x0 to scratchpad register */
2248 Data = 0x00;
2249 status = mos7840_set_uart_reg(port, SCRATCH_PAD_REGISTER, Data);
2250 if (status < 0) {
2251 dev_dbg(&port->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status);
2252 goto out;
2253 } else
2254 dev_dbg(&port->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status);
2255
2256 /* Zero Length flag register */
2257 if ((mos7840_port->port_num != 1) && (serial->num_ports == 2)) {
2258 Data = 0xff;
2259 status = mos7840_set_reg_sync(port,
2260 (__u16) (ZLP_REG1 +
2261 ((__u16)mos7840_port->port_num)), Data);
2262 dev_dbg(&port->dev, "ZLIP offset %x\n",
2263 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num)));
2264 if (status < 0) {
2265 dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 2, status);
2266 goto out;
2267 } else
2268 dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 2, status);
2269 } else {
2270 Data = 0xff;
2271 status = mos7840_set_reg_sync(port,
2272 (__u16) (ZLP_REG1 +
2273 ((__u16)mos7840_port->port_num) - 0x1), Data);
2274 dev_dbg(&port->dev, "ZLIP offset %x\n",
2275 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1));
2276 if (status < 0) {
2277 dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 1, status);
2278 goto out;
2279 } else
2280 dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 1, status);
2281
2282 }
2283 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2284 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2285 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2286 GFP_KERNEL);
2287 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2288 !mos7840_port->dr) {
2289 status = -ENOMEM;
2290 goto error;
2291 }
2292
2293 mos7840_port->has_led = false;
2294
2295 /* Initialize LED timers */
2296 if (device_type == MOSCHIP_DEVICE_ID_7810) {
2297 mos7840_port->has_led = true;
2298
2299 mos7840_port->led_urb = usb_alloc_urb(0, GFP_KERNEL);
2300 mos7840_port->led_dr = kmalloc(sizeof(*mos7840_port->led_dr),
2301 GFP_KERNEL);
2302 if (!mos7840_port->led_urb || !mos7840_port->led_dr) {
2303 status = -ENOMEM;
2304 goto error;
2305 }
2306
2307 timer_setup(&mos7840_port->led_timer1, mos7840_led_off, 0);
2308 mos7840_port->led_timer1.expires =
2309 jiffies + msecs_to_jiffies(LED_ON_MS);
2310 timer_setup(&mos7840_port->led_timer2, mos7840_led_flag_off,
2311 0);
2312 mos7840_port->led_timer2.expires =
2313 jiffies + msecs_to_jiffies(LED_OFF_MS);
2314
2315 /* Turn off LED */
2316 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2317 }
2318 out:
2319 if (pnum == serial->num_ports - 1) {
2320 /* Zero Length flag enable */
2321 Data = 0x0f;
2322 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2323 if (status < 0) {
2324 dev_dbg(&port->dev, "Writing ZLP_REG5 failed status-0x%x\n", status);
2325 goto error;
2326 } else
2327 dev_dbg(&port->dev, "ZLP_REG5 Writing success status%d\n", status);
2328 }
2329 return 0;
2330 error:
2331 kfree(mos7840_port->led_dr);
2332 usb_free_urb(mos7840_port->led_urb);
2333 kfree(mos7840_port->dr);
2334 kfree(mos7840_port->ctrl_buf);
2335 usb_free_urb(mos7840_port->control_urb);
2336 kfree(mos7840_port);
2337
2338 return status;
2339 }
2340
2341 static int mos7840_port_remove(struct usb_serial_port *port)
2342 {
2343 struct moschip_port *mos7840_port;
2344
2345 mos7840_port = mos7840_get_port_private(port);
2346
2347 if (mos7840_port->has_led) {
2348 /* Turn off LED */
2349 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2350
2351 del_timer_sync(&mos7840_port->led_timer1);
2352 del_timer_sync(&mos7840_port->led_timer2);
2353
2354 usb_kill_urb(mos7840_port->led_urb);
2355 usb_free_urb(mos7840_port->led_urb);
2356 kfree(mos7840_port->led_dr);
2357 }
2358 usb_kill_urb(mos7840_port->control_urb);
2359 usb_free_urb(mos7840_port->control_urb);
2360 kfree(mos7840_port->ctrl_buf);
2361 kfree(mos7840_port->dr);
2362 kfree(mos7840_port);
2363
2364 return 0;
2365 }
2366
2367 static struct usb_serial_driver moschip7840_4port_device = {
2368 .driver = {
2369 .owner = THIS_MODULE,
2370 .name = "mos7840",
2371 },
2372 .description = DRIVER_DESC,
2373 .id_table = id_table,
2374 .num_interrupt_in = 1,
2375 .open = mos7840_open,
2376 .close = mos7840_close,
2377 .write = mos7840_write,
2378 .write_room = mos7840_write_room,
2379 .chars_in_buffer = mos7840_chars_in_buffer,
2380 .throttle = mos7840_throttle,
2381 .unthrottle = mos7840_unthrottle,
2382 .calc_num_ports = mos7840_calc_num_ports,
2383 .probe = mos7840_probe,
2384 .ioctl = mos7840_ioctl,
2385 .set_termios = mos7840_set_termios,
2386 .break_ctl = mos7840_break,
2387 .tiocmget = mos7840_tiocmget,
2388 .tiocmset = mos7840_tiocmset,
2389 .tiocmiwait = usb_serial_generic_tiocmiwait,
2390 .get_icount = usb_serial_generic_get_icount,
2391 .port_probe = mos7840_port_probe,
2392 .port_remove = mos7840_port_remove,
2393 .read_bulk_callback = mos7840_bulk_in_callback,
2394 .read_int_callback = mos7840_interrupt_callback,
2395 };
2396
2397 static struct usb_serial_driver * const serial_drivers[] = {
2398 &moschip7840_4port_device, NULL
2399 };
2400
2401 module_usb_serial_driver(serial_drivers, id_table);
2402
2403 MODULE_DESCRIPTION(DRIVER_DESC);
2404 MODULE_LICENSE("GPL");
Linux with added FPC-III support